使用裝飾設計模式加密數據：

package com.zs.JiaJiE09;import java.io.FileOutputStream;import java.io.IOException;import java.io.OutputStream;/**
 * 使用裝飾設計模式把數據取反進行加密解密
 * Key方法為鑰匙
 *
 * @author LZG
 *
 */public class JMOutputStream extends OutputStream{/**
 * 更多資料歡迎瀏覽凱哥學堂官網：http://kaige123.com 

 * @author 小沫
 */

	private int key;	private OutputStream output;	public JMOutputStream(OutputStream output){		this.output=output;
		
	}	public void Key(int key){		this.key=key;
	}	
	public void write(int b) throws IOException {
		output.write(~b+key);
	}	
	
	public void write(byte[] b, int off, int len) throws IOException {		for (int i = off; i < len; i++) {
			output.write(~b[i]+key);
		}
	}	public void write(byte[] b) throws IOException {		for (int i = 0; i < b.length; i++) {
			output.write(~b[i]+key);
		}
	}
	
}

測試類：

package com.zs.JiaJiE09;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;public class Test {/**
 * 更多資料歡迎瀏覽凱哥學堂官網：http://kaige123.com 

 * @author 小沫
 */

	public static void main(String[] args) throws IOException{
		
		
		FileInputStream fin= new FileInputStream("e:/test/aa.txt");
		
		JMOutputStream fout = new JMOutputStream(new FileOutputStream("d:/test/aa111.txt"));
		fout.Key(1402);		byte[] b = new byte[1024];		
		while(fin.available()!=0){			int len = fin.read(b);
			fout.write(b, 0, len);
		}
		
		fin.close();
		fout.close();
	}
}

使用裝飾設計模式加密數據